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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fa91d0552869f6cebcead22f3222394b3421e74bf81222c5a80fc9caf60655c' 
  AND token = '8aIS4KPLpxYZxi5JasFvDgsx05qPNhBkOYM5sRUOW3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}